Fine silt, deposited in ancient rivers and lakes.

即远古时期河湖中沉积的细泥。

Two years ago in a former anoxic silt deposit I have found animal bones from between 275 and 1300 AD.

两年前，我在一个以前缺氧的淤泥沉积物中发现了公元 275 年至 1300 年之间的动物骨头。